KVM: x86/mmu: Use KVM_REQ_TLB_FLUSH_CURRENT for MMU specific flushes

Flush only the current ASID/context when requesting a TLB flush due to a
change in the current vCPU's MMU to avoid blasting away TLB entries
associated with other ASIDs/contexts, e.g. entries cached for L1 when
a change in L2's MMU requires a flush.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200320212833.3507-26-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/mmu/mmu.c

@@ -2309,7 +2309,7 @@ static void kvm_mmu_flush_or_zap(struct kvm_vcpu *vcpu,
 		return;
 
 	if (local_flush)
-		kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
+		kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu);
 }
 
 #ifdef CONFIG_KVM_MMU_AUDIT
@@ -2516,11 +2516,11 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
 				break;
 
 			WARN_ON(!list_empty(&invalid_list));
-			kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
+			kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu);
 		}
 
 		if (sp->unsync_children)
-			kvm_make_request(KVM_REQ_MMU_SYNC, vcpu);
+			kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu);
 
 		__clear_sp_write_flooding_count(sp);
 		trace_kvm_mmu_get_page(sp, false);
@@ -3121,7 +3121,7 @@ static int mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
 	if (set_spte_ret & SET_SPTE_WRITE_PROTECTED_PT) {
 		if (write_fault)
 			ret = RET_PF_EMULATE;
-		kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
+		kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu);
 	}
 
 	if (set_spte_ret & SET_SPTE_NEED_REMOTE_TLB_FLUSH || flush)
@@ -4310,7 +4310,7 @@ static bool fast_cr3_switch(struct kvm_vcpu *vcpu, gpa_t new_cr3,
 			kvm_make_request(KVM_REQ_LOAD_MMU_PGD, vcpu);
 			if (!skip_tlb_flush) {
 				kvm_make_request(KVM_REQ_MMU_SYNC, vcpu);
-				kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
+				kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu);
 			}
 
 			/*
@@ -5179,7 +5179,7 @@ int kvm_mmu_load(struct kvm_vcpu *vcpu)
 	if (r)
 		goto out;
 	kvm_mmu_load_pgd(vcpu);
-	kvm_x86_ops.tlb_flush_all(vcpu);
+	kvm_x86_ops.tlb_flush_current(vcpu);
 out:
 	return r;
 }